Question about 1992 Ford F150 SuperCab

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I have a 7 pin adapter on my truck and my trailer has a 4 pin adapter, i bought a 7-4 pin adapter and my trailer lights still not working properly

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Sounds like bad ground check the groud to trailer

Posted on Apr 23, 2015

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  • Ford Master
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Trailer lamps usually have dual filiments in a single bulb, whereas newer cars have sepaprate bulbs for each function. The two different types do not play well together. Go to a good parts store or u-haul dealer and they can provide a logic box that can fix this issue.

Posted on Apr 23, 2015

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1 Answer

When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

mr_brokrench_4.jpg

Sep 18, 2011 | Honda Accord Cars & Trucks

1 Answer

I Have an 2005 chevy duramax. i purchased and S&H horse Trailer. When i plug a five prong round into the seven pin with an adapter the horse trailer on the passenger side wheel locks and drags


I would start by making sure the emergency break away switch has the plunger in it and it's working properly. If everything is OK with that then the 5 pin plug must be wired incorrectly. If you only tow the trailer with that truck I would suggest changing to a seven pin connector on the trailer. It would appear you also have a problem with the left trailer brake. They should work together.

Jun 02, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

I'm trying to hook up a 4 pin plug to a 6 pin receptacle? When I apply hazard the license plate light flashes?


I'm guessing that you're talking about a trailer wire connection.
The easiest wayis to use an adaptor like this:

zeevert_72.jpg Available on Ebay for $13 on Ebay.
Maybe at trailer supplier or auto parts store?

Search for:
Trailer Plug Cord Wire Adapter 6 round to 4 flat

Apr 25, 2011 | Chevrolet C3500 Cars & Trucks

1 Answer

Hi, we recently bought a 2010 Honda odyssey and ha...


is the trailer attached to the ball on the van?? could be a ground problem,,run a jumper from hitch to trailer see if that works,,

May 21, 2010 | Cars & Trucks

1 Answer

After a rear end collision, the turn signals and 4-way flashers don't work right. turn on left signal and all lights in rear flash.


Sounds like a ground problem, and the turn signal is trying to use another path to ground, causing the other lights to glow.

Check the left side bulb socket for a good ground.

The other test is to pull the L & R Stop / Turn fuses for the trailer tow adapter, to make sure the problem is not with the 4 or 7 pin trailer adapters.

May 04, 2010 | 2006 Ford F-150

1 Answer

I just rewired my 20'deckover trailer. I used good quality lcd's. I have the 7 and 4 pin plugs. everything works but the parking lights on both plugs. I have a 2006 f-150 extended cab. bought a test plug...


Did you check the fuse for the trailer tow adapter parking lamps ? This is a separate fuse from the truck's parking lamps.
Fuse #10 is the Trailer Tow parking lamps ( via the trailer tow parking lamp relay ) and this is the same fuse for the trailer tow reversing lamps ( via the trailer tow reversing lamp relay ).

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Diagrams for the Trailer Tow adapter :

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Feb 21, 2010 | 2006 Ford F-150

2 Answers

I have a 2008 Ford F 150 with factory installed trailer wiring. I bought a trailer plug tester. It shows the tail light function to be dead. Brake lights, turn signals all work. Any ideas?


The trailer tow adapter parking lamps is fuse #10 in the cab fuse panel. There is also a trailer tow parking lamp relay that powers them, which could have a problem as well.
Start with the fuse, and maybe check both the 7 pin and the 4 pin for the parking lamps, could be a corroded pin on one of them causing the tester to not see the power on the pin.

Dec 17, 2009 | 2008 Ford F 150 2WD

1 Answer

Trailer lights


7 pin standard codes: Blue Brakes, Black 12v power, white ground, red right turn, brown left turn, green marking lights, yellow accessory power. 4 pin standard codes: White ground, brown marking lights, yellow left turn, green right turn. These will only work if both were wired to the standard code.

Jul 11, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

Wiring diagram


If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.

Apr 15, 2009 | 2006 Chevrolet Trailblazer

2 Answers

Back-up lights and trailer running lights


My 2004 f150 has the factory tow package. It has a fuse for the trailer running lights seperate from the truck running light fuse.
Check, you may have the same set up...

Jul 21, 2008 | 2004 Ford F150

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